/*
 * Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
 * Original author: Edmund Wagner
 * Creation date: 31.05.2007
 *
 * Source: $HeadURL$
 * Last changed: $LastChangedDate$
 * 
 * the unrar licence applies to all junrar source and binary distributions 
 * you are not allowed to use this source to re-create the RAR compression algorithm
 * 
 * Here some html entities which can be used for escaping javadoc tags:
 * "&":  "&#038;" or "&amp;"
 * "<":  "&#060;" or "&lt;"
 * ">":  "&#062;" or "&gt;"
 * "@":  "&#064;" 
 */
package de.innosystec.unrar.unpack;

import de.innosystec.unrar.Archive;
import de.innosystec.unrar.Volume;
import de.innosystec.unrar.crc.RarCRC;
import de.innosystec.unrar.exception.RarException;
import de.innosystec.unrar.io.ReadOnlyAccessInputStream;
import de.innosystec.unrar.rarfile.FileHeader;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * DOCUMENT ME
 * 
 * @author $LastChangedBy$
 * @version $LastChangedRevision$
 */
public class ComprDataIO {

	private final Archive archive;

	private long unpPackedSize;

	private boolean testMode;

	private boolean skipUnpCRC;

	private InputStream inputStream;

	private OutputStream outputStream;


	private FileHeader subHead;

	// cryptData Crypt;
	// cryptData Decrypt;
	private boolean packVolume;

	private boolean unpVolume;

	private boolean nextVolumeMissing;

	private long totalPackRead;

	private long unpArcSize;

	private long curPackRead, curPackWrite, curUnpRead, curUnpWrite;

	private long processedArcSize, totalArcSize;

	private long packFileCRC, unpFileCRC, packedCRC;

	private int encryption;

	private int decryption;

	private int lastPercent;

	private char currentCommand;

	public ComprDataIO(Archive arc) {
		this.archive = arc;
	}

	public void init(OutputStream outputStream) {
		this.outputStream = outputStream;
		unpPackedSize = 0;
		testMode = false;
		skipUnpCRC = false;
		packVolume = false;
		unpVolume = false;
		nextVolumeMissing = false;
		// command = null;
		encryption = 0;
		decryption = 0;
		totalPackRead = 0;
		curPackRead = curPackWrite = curUnpRead = curUnpWrite = 0;
		packFileCRC = unpFileCRC = packedCRC = 0xffffffff;
		lastPercent = -1;
		subHead = null;

		currentCommand = 0;
		processedArcSize = totalArcSize = 0;
	}

    public void init(FileHeader hd) throws IOException {
        long startPos = hd.getPositionInFile() + hd.getHeaderSize();
        if(archive.getMainHeader().isEncrypted()){
        	startPos += hd.getPaddedSize()+8;
        }
        unpPackedSize = hd.getFullPackSize();
        inputStream = new ReadOnlyAccessInputStream(
                archive.getRof(), 
                hd,
                startPos,
                startPos + unpPackedSize);
		subHead = hd;
        curUnpRead = 0;
        curPackWrite = 0;
        packedCRC = 0xFFffFFff;
    }

    public int unpRead(byte[] addr, int offset, int count)
            throws IOException, RarException {
        int retCode=0, totalRead=0;
        while (count > 0) {
            int readSize = (count > unpPackedSize) ? (int)unpPackedSize : count;
            retCode = inputStream.read(addr, offset, readSize);
            if (retCode < 0) {
                throw new EOFException();
            }
            if (subHead.isSplitAfter()){
                packedCRC = RarCRC.checkCrc(
                        (int)packedCRC, addr, offset, retCode);
            }

            curUnpRead += retCode;
            totalRead += retCode;
            offset += retCode;
            count -= retCode;
            unpPackedSize -= retCode;
            archive.bytesReadRead(retCode);
            if (unpPackedSize == 0 && subHead.isSplitAfter()) {
                if (!Volume.mergeArchive(archive, this)) {
                    nextVolumeMissing=true;
                    return -1;
                }
            }
            else {
                break;
            }
        }

        if (retCode != -1) {
            retCode = totalRead;
        }
        return retCode;


	}

	public void unpWrite(byte[] addr, int offset, int count)
            throws IOException {
		if (!testMode) {
			// DestFile->Write(Addr,Count);
			outputStream.write(addr, offset, count);
		}

		curUnpWrite += count;

		if (!skipUnpCRC){
			if (archive.isOldFormat()){
				unpFileCRC = RarCRC.checkOldCrc(
                        (short)unpFileCRC, addr, count);
			}
			else{
				unpFileCRC = RarCRC.checkCrc(
                        (int)unpFileCRC, addr,offset, count);
			}
		}
//            if (!skipArcCRC) {
//                archive.updateDataCRC(Addr, offset, ReadSize);
//            }
	}

	public void setPackedSizeToRead(long size)
	{
		unpPackedSize = size;
	}

	public void setTestMode(boolean mode)
	{
		testMode = mode;
	}

	public boolean isTestMode() {
		return testMode;
	}

	public void setSkipUnpCRC(boolean skip)
	{
		skipUnpCRC = skip;
	}

	public void setSubHeader(FileHeader hd)
	{
		subHead = hd;

	}

	public long getCurPackRead()
	{
		return curPackRead;
	}

	public void setCurPackRead(long curPackRead)
	{
		this.curPackRead = curPackRead;
	}

	public long getCurPackWrite()
	{
		return curPackWrite;
	}

	public void setCurPackWrite(long curPackWrite)
	{
		this.curPackWrite = curPackWrite;
	}

	public long getCurUnpRead()
	{
		return curUnpRead;
	}

	public void setCurUnpRead(long curUnpRead)
	{
		this.curUnpRead = curUnpRead;
	}

	public long getCurUnpWrite()
	{
		return curUnpWrite;
	}

	public void setCurUnpWrite(long curUnpWrite)
	{
		this.curUnpWrite = curUnpWrite;
	}

	public int getDecryption()
	{
		return decryption;
	}

	public void setDecryption(int decryption)
	{
		this.decryption = decryption;
	}

	public int getEncryption()
	{
		return encryption;
	}

	public void setEncryption(int encryption)
	{
		this.encryption = encryption;
	}

	public boolean isNextVolumeMissing()
	{
		return nextVolumeMissing;
	}

	public void setNextVolumeMissing(boolean nextVolumeMissing)
	{
		this.nextVolumeMissing = nextVolumeMissing;
	}

	public long getPackedCRC() {
		return packedCRC;
	}

    public void setPackedCRC(long packedCRC) {
        this.packedCRC = packedCRC;
    }

	public long getPackFileCRC()
	{
		return packFileCRC;
	}

	public void setPackFileCRC(long packFileCRC)
	{
		this.packFileCRC = packFileCRC;
	}

	public boolean isPackVolume()
	{
		return packVolume;
	}

	public void setPackVolume(boolean packVolume)
	{
		this.packVolume = packVolume;
	}

	public long getProcessedArcSize()
	{
		return processedArcSize;
	}

	public void setProcessedArcSize(long processedArcSize)
	{
		this.processedArcSize = processedArcSize;
	}

	public long getTotalArcSize()
	{
		return totalArcSize;
	}

	public void setTotalArcSize(long totalArcSize)
	{
		this.totalArcSize = totalArcSize;
	}

	public long getTotalPackRead()
	{
		return totalPackRead;
	}

	public void setTotalPackRead(long totalPackRead)
	{
		this.totalPackRead = totalPackRead;
	}

	public long getUnpArcSize()
	{
		return unpArcSize;
	}

	public void setUnpArcSize(long unpArcSize)
	{
		this.unpArcSize = unpArcSize;
	}

	public long getUnpFileCRC()
	{
		return unpFileCRC;
	}

	public void setUnpFileCRC(long unpFileCRC)
	{
		this.unpFileCRC = unpFileCRC;
	}

	public boolean isUnpVolume()
	{
		return unpVolume;
	}

	public void setUnpVolume(boolean unpVolume)
	{
		this.unpVolume = unpVolume;
	}

	public FileHeader getSubHeader()
	{
		return subHead;
	}

	
	
//	public void setEncryption(int method, char[] Password, byte[] Salt,
//			boolean encrypt, boolean handsOffHash)
//	{
//
//	}
//
//	public void setAV15Encryption()
//	{
//
//	}
//
//	public void setCmt13Encryption()
//	{
//
//	}
}
